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# Human Health Risk Assessment Protocol (HHRAP)for Hazardous Waste Combustion Facilities, Final

Human Health Risk Assessment Document | Appendices and Chemical Specific Data | Support Materials | Important Notice

This Final HHRAP (EPA520-R-05-006) updates and repl aces the 1998 Peer Review Draft version of the HHRAP (EPA530-D-98-001).

Highlights of changes include (but are certainly no t limited to):

We've sculpted the tone of the language throughout the document to make clear that the HHRAP is guidance: the various equations, param eter values, and such are our recommendations, and not requirements. A new method (replacing the Travis & Arms (1988) eq uations) for estimating biotransfer of chemicals into beef and milk cattle. Clarifications – for example we've further explained (and made co nsistent) how we recommend deriving exposure scenario consumption ra tes. Mercury - we've modified our recommended method for estima ting mercury loading to waterbodies, to address potential mass-balance i ssues. Dry Vapor Phase Deposition - We've modified the deposition equations to inclu de ISCST3's ability to model dry vapor phase depositio n. New Tox Hierarchies - we've brought the recommended hierarchy of sourc es for chronic tox benchmarks (PDF) (4 pp, 228K) into harmony with Superfund and the rest of OSWER. We also added a recommended hierarchy of sources for acute tox benchmarks. The Hazardous Waste Companion Database (ACCESS) (3.3MB) - This database updates and replaces the hard-copy listing of chemical-spec ific parameter values originally found in Appendix A of the 1998 HHRAP. We've commit ted to maintaining the currentness of the database, and will post periodic updates on the same web site; A new central email account, "HHRAPFeedback@epa.gov " for questions/comments.

These are just some of the changes. We encourage yo u to read and use this resource. If you have questions or comments (particularly on how we might make the database more userfriendly), please email us.

Risk assessment is a science used to evaluate the c arcinogenic risks and noncarcinogenic hazards to human health that are attributable to em issions from hazardous waste combustion units. These risk assessments include the evaluatio n of both direct and indirect risks. There is sufficient guidance available regarding the perform ance of direct inhalation risk assessments. On the other hand, indirect risk assessments are ne wer and more complex. As a result, this



## Wastes - Hazardous Waste - Treatment & Disposal Page 1 of 2 Human Health Risk Assessment | Combustion | Wastes | US EPA

12/6/2011 http://www.epa.gov/epawaste/hazard/tsd/td/combust/r isk.htmYou will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn
more. document describes the evaluation of direct inhalat ion risk, but primarily focuses on the procedures used to estimate risk resulting from ind irect pathways.

Human Health Risk Assessment Document

Download Entire Main Document as a Zipped File (3.2MB) - Warning: large file size may extend download time Download By Sections

Appendices and Chemical Specific Data

Download all Appendices as a Zipped File (2.3MB) - Does not include chemical specific database Download Database or Individual Appendices

Support Materials

Methodology for Predicting Cattle Biotransfer Facto rs Details the research performed to derive a new meth od for estimating biotransfer factors for beef and milk cattle. Response to Comments Document Details the chronology of both public- and external peer-review processes. Summarizes all public comments and gives our respon ses Lists the Charges to the external peer review panel members, their responses, and our replies.
Download Both Support Documents as a Zipped File (3.8MB) - Warning: large file size may extend download time Download By Document



### Important Notice

How can I get copies of the now-superceded Peer Review Draft and Supporting Documents? A CD that contains the draft version of the guidanc e, as well as supporting documents such as those related to the external peer-review process, can be requested from EPA. Send your request to:
US Environmental Protection Agency Office of Solid Waste ATTN: HHRAP Support Mail Code 5307P 1200 Pennsylvania Avenue, NW Washington, DC 20460
You may also request to have these files emailed to you. http://www.epa.gov/epawaste/hazard/tsd/td/combust/r isk.htm

Last updated on Friday, September 05, 2008 

### Page 2 of 2 Human Health Risk Assessment | Combustion | Wastes | US EPA

12/6/2011 http://www.epa.gov/epawaste/hazard/tsd/td/combust/r isk.htm